Institutional Manager · CIK 0001488542

SIMPLEX TRADING, LLC

CHICAGO, IL · File #028-16834

Latest AUM

$177.42B

Positions

9,381

Top-10 Concentration

67.0%

Filings

Portfolio Value Over Time

2024-03

2024-06

2024-09

2024-12

2025-03

2025-06

2025-09

2025-12

Biggest QoQ Changes

Ranked by conviction flow (share change × current price) so mark-to-market moves don't dominate. Price effect column shows how much of the $ change was just the stock moving.

Action	Issuer	Ticker / CUSIP	Δ Shares	Flow ($)	Price Effect
REDUCE	SPDR S&P 500 ETF TR	SPY	-5,486,600	-$3.74B	+$31.84B
REDUCE	INVESCO QQQ TR	IVZ	-3,586,900	-$2.20B	+$11.63B
ADD	META PLATFORMS INC	META	+1,537,600	+$1.01B	+$2.02B
ADD	INVESCO QQQ TR	IVZ	+1,557,100	+$956.5M	+$4.90B
ADD	NETFLIX INC	NFLX	+9,142,400	+$857.2M	+$84.9M
ADD	NETFLIX INC	NFLX	+9,063,900	+$849.8M	+$61.2M
REDUCE	SPDR GOLD TR	GLD	-1,847,600	-$732.2M	+$2.38B
ADD	SPDR S&P 500 ETF TR	SPY	+1,056,700	+$720.6M	+$12.52B
ADD	VANECK ETF TRUST	92189F952	+1,640,600	+$590.8M	+$396,124
ADD	STRATEGY INC	STRK	+3,812,200	+$579.3M	+$288,493

Sector Allocation

Technology

18.8%$33.29B

Financials

10.4%$18.46B

Consumer Discretionary

9.8%$17.49B

Communication Services

4.8%$8.46B

2.6%$4.63B

1.4%$2.50B

0.8%$1.49B

0.8%$1.44B

0.6%$1.01B

0.3%$532.3M

0.1%$141.2M

Filing History

Feb 11, 202613F HOLDINGS REPORTQ/E Dec 20259,381 pos · $177.42B
Nov 12, 202513F HOLDINGS REPORTQ/E Sep 202510,359 pos · $194.9M
Aug 5, 202513F HOLDINGS REPORTQ/E Jun 20259,904 pos · $174.6M
May 12, 202513F HOLDINGS REPORTQ/E Mar 20259,739 pos · $156.2M
Feb 11, 202513F HOLDINGS REPORTQ/E Dec 20249,701 pos · $178.6M
Nov 8, 202413F HOLDINGS REPORTQ/E Sep 20249,647 pos · $170.4M
Jul 25, 202413F HOLDINGS REPORTQ/E Jun 20249,955 pos · $161.9M
Apr 25, 202413F HOLDINGS REPORTQ/E Mar 202410,037 pos · $173.1M
Nov 1, 202313F HOLDINGS REPORTQ/E Dec 20239,859 pos · $127.1M

Top 20 Holdings — Dec 2025

#	Issuer	Ticker	Shares	Value	% of Portfolio
1	SPDR S&P 500 ETF TR	SPY	41,254,200	$28.13B	22.17%
2	SPDR S&P 500 ETF TR	SPY	19,433,600	$13.25B	10.44%
3	INVESCO QQQ TR	IVZ	15,365,400	$9.44B	7.44%
4	INVESCO QQQ TR	IVZ	9,538,600	$5.86B	4.62%
5	TESLA INC	TSLA	12,842,700	$5.78B	4.55%
6	NVIDIA CORPORATION	NVDA	28,686,200	$5.35B	4.22%
7	TESLA INC	TSLA	11,691,000	$5.26B	4.14%
8	NVIDIA CORPORATION	NVDA	26,359,200	$4.92B	3.87%
9	ISHARES TR	464287957	16,281,500	$4.01B	3.16%
10	META PLATFORMS INC	META	4,605,900	$3.04B	2.40%
11	SPDR GOLD TR	GLD	6,421,700	$2.54B	2.01%
12	APPLE INC	AAPL	9,285,900	$2.52B	1.99%
13	APPLE INC	AAPL	7,745,900	$2.11B	1.66%
14	ISHARES TR	464287907	7,824,800	$1.93B	1.52%
15	ALPHABET INC	GOOG	6,083,500	$1.90B	1.50%
16	SPDR GOLD TR	GLD	4,151,600	$1.65B	1.30%
17	META PLATFORMS INC	META	2,425,600	$1.60B	1.26%
18	ALPHABET INC	GOOG	4,929,700	$1.54B	1.22%
19	MICROSOFT CORP	MSFT	3,087,200	$1.49B	1.18%
20	AMAZON COM INC	AMZN	5,860,700	$1.35B	1.07%